Furnace-door frame



Uec. 21, 1926. llw

o. H. DAWSON FURNACE DOOR FRAME Filed May 2S 1925 3 Sheets-Sheee l mmm@ Deu 2l i926.

O. H. DAVISON FURNACE DOOR FRAME 5 Sheets-Sheet Filed May 28 FEG. 10

' HNVENTOR @wmf fwd

,if a

FURNAGE-DQOR FRAME.

Application filed May 2Q, 19%.

My invention relates to furnace door frames, and particularly to those of the water-cooled type wherein the metal framework or support for the brick lining is provided with passages for the circulation of cooling fluid, and to those structures wherein the door frames are removable, irrespective of the cooling feature.

Furnace doors were originally provided with cast metal frames that were faced and lined with brick-work which protected them from the heat of the furnace, and also prevented excessive absorption of heat by the metal parts. in charging these furnaces by hand, little difficulty was experienced in the way of dislodging the brick lining. However, with the advent of charging machines it became necessary to find a substitute for the dry door (uncooled) frames because the charging apparatus broke away the exposed brick lining that was employed to protect the inside edges of the door frame. 'llo overcome this objection a metal frame was provided which was unprotected on its inner exposed edges, but which was provided with passages for the flow of coolin Huid.

While the metal frames just referred to, with the exposed metal edges, would withstand blows from the charging apparatus, they are objectionable in that it has heretofore been deemed necessary to build the brick-work up separately and then move the metal frame into place against the exterior of the brick-work. The brick-work is usually renewed while the furnaces are still so hot that a brick-layer can work for periods of only a few minutes each. This is not conducive to good workmanship and a close lit between the brick-work andthe metal door frames is not Secured when the said frames are put back into place, there being nearly always a spa'cevbetween the door frames and the brick work. This space is increased when the furnace is brought back to normal heat by reason of the fact that the brick expands and the wall Warps. Heat lost by circulation through this space has been found in some cases to be equivalent to Q00 lbs. of coal per hour. If the frames are not faced by brick or other refractory material, the loss of heat taken up by the water cooled parts is excessive, and may equalthat of one-half of the fuel consumed. Further, lif the water cooled parts are too greatly exposed to the heat of the furnace, as by falling of the brick work, steam may be generated therein so rapidly Serial No. 33,384.

as to cause explosions, and particularly so on a tilting furnace.

My invention has for its object the provlsion of door frames of such form that they may be faced or lined with brick at a point removed from the furnace so that the brick work and the iron work together form a unitary structure which can, be economically and conveniently placed in the furnace opening. This arrangement permits of more accurate lining of the metal frame and when it becomes necessary to change a door, bccause of a leak in the cooling system, or because it is necessary to renew the door arch or door jambs, a new frame can be picked off with a crane and set in place as easily as the old frame which'had no brick in it.

A further object is to more adequately protect parts heretofore not sufficientlv shielded from the heat. u

Still another object of my invention is to simplify and improve generally the structure and effectiveness of furnace door'frames.

Some of the forms which my invention may take are shown in the accompanying drawing wherein Fig. l is a front elevational view of a portion of a furnace equipped with my invention; Fig. 2 is a view taken on the line 2-2 of Fig. `l; Fig. 3. is a view, on an enlarged scale, of a portion of theapparatus of Fig. 1, but showing such apparatus partially in front elevation and partially in section; Fig. d is a view taken on the line 4`e-42of Fig. 3; Fig. 5 is a view taken on the line 5-,5 of Fig. 42; Fig. 6 i-s a view taken on the line 6 6 of Fig. 3i Fig. 7 is a view showing a modified form of door frame; Fig. 8 is a view showing still another modification; Fig. 9 is a view on the line Q-9 of Fig. 8, and Fig. 10 is a view showing-` a further modification embodying my invention.

For convenience of illustration ll have show n my apparatus applied to the door opening of a furnace 12 that is provided with the usual skew back 13 and skew back channel 13a. .The furnace is provided with a door 14 that may be elevated by means of the piston of a cylinder 15 that has connection with the door through rods 16 and links 17. The cylinder 15 is supported upon channel irons 18 that also support the skew back channel 13a through bolts 19. These parts nay all be of somewhat the usual construcion. l

My invention relates particularly to the door frame and, as shown more clearly in Fig. 3, comprises an arch member that may be composed of sheet or pressed metal plates welded together to form chambers or passages for the circulation of cooling Huid, such iuid entering through pipes 2l and flowingr off through pipe 22. Door jamb members 23, which may also be made of metal plates Welded to ether, are provided with inlets 24 and out ets 25 for Water or other cooling iiuid.

The arch member 2O is provided with a forwardly extending chamber portion 26 as shown more clearly in Figs. 2 and 4, into which the cooling fluid may enter. This ex'- tension 26 is connected to the vertically 'ex-l tending portions 27 and serves to tie them together, to prevent spreading thereof. The

' charnbered portion 26 also serves to protect -protected by the bricks.

the bottom iange of the skew back channel from the heat of the furnace and assists in holding the bricks 28 in place and is in turn The arch member 2O is lined with bricks 28 that protect it from the heat of the fur nace, and also conserves the. furnace heat. The member 20 may be removed and replaced atwill, since it is provided with ianges 20av that are bolted to buck stays 30, as shown more clearly in Fig. 5. The forward edges of the extension 27 are protected by br1ck-work 3l that may form part of the wall of the furnace. The arch bricks 28 are partially supported by the inturned ends 32 of the arch member 20.

As shown more clearly in Fig. 2, the lower edge of the metallic member 20 is substantially flush with the lower face of the bricks 28, thus defining the top wall of the opening and protecting the bricks from injury by the charging apparatus.

The jamb members 23 are provided with extensions 34 and 35, as shown more clearly in Fig. 6, and are also provided with a horizontally extending portion 36, as shown in Fig. 4. The portion 36 serves to support the liner bricks 37 for the jambs 23, such bricks being flanged as shown in Figs. 2 and 6 to protect the extensions 35 and 36 from the heat. The end walls of the extensions 34 are exposed to the heat but serve to define the side walls of the opening and protect the liner brick 37 from the charging apparatus. The members 23 are bolted to buck stays 30 by means of flanges 39 through which bolts may pass.

From the foregoing; it will be seen that I build a frame of three units; two jambs and one arch, each of which together with its lining brick constitutes a unitary structure, and all of which are so arranged individually and relatively to one another, and also relative to the other metal parts of the -furnace, as to insure against unnecessary contact` of the heat of the furnace with the metal parts. The units are separately removable, so that a damaged unit can be replaced without scrapping the whole furnace, and smaller investment for repair parts is required than if the whole frame had to be replaced when one part Wore out.

Referring to Fig. 7, I show a structure similar in some respects to Figs. 1 to 6, but wherein the door frame is made in one piece instead of in three pieces corresponding to parts 2O and 23 of Fig. 3. The structure of Fig. 7 embodies a hollow metal door frame 4.1 which has vertical jamb portions and a connecting rod supporting portion 42. Liner bricks 43 for the jamb portions are supported upon the frame extension 44, while the arch bricks are supported upon the bricks 43. The frame 41 may be removed for repairs, in the same manner as are the frame sections 20 and 23 ofv Figs. 1 to 6. The frame 41 has an extension 41a that'protects the bricks 45 from damage by the charging apparatus.

In Flgs. 8 and 9 I have shown still another form of one-piece door frame that in general resembles that shown in Fig. -7, but which more adequately protects the brick-work from injury by the charging` apparatus. This frame 46 has the same general form as the frame 41 but contains in addition a chambered portion 47 that extends inward in an angular direction and through which cooling fluid may flow. The liner brick 48 abuts against the inner edge of the extension 47. The extension 47 serves to more fully protect the liner brick from the charging apparatus than does the portion 41a of the frame of Fig. 7, since it extends inwardly for a greater distance. The frame 46 is provided with a anged extension 49 that may be bolted to the buck stays 30.

Still another form which my invention may take is shown in Fig. 10 wherein the door frame is composed of two jamb sections 51 and an arch section 5 2 which is disposed between such jamb sections. The liner brick for the section 52 may be supported in a manner similar to the arrangement shown inl Figs. 1 to 6, while the liner brick for the frame members 51 may be supported upon inward extensions 51 at the bottom-of said sections, as are the bricks 37 in Fig. 2. The principal difference between the structure of Fig. 10 and that of Figs. 1 to 6 resides in the extension of the.

jamb member 51 to points opposite the ends of'the arch section 52, instead of terminating vbeneath the lower edges of said arch,l as

shown in Fig. 3.

It will be `apparent that various other changes in detail and general arrangement may be made without departing from the spirit and scope of the invention as defined in the accompanying claims. For instance,

the door frame may be made of general cir` cular contour.

I claim as my invention:

1. The combination with a furnace having a charging opening, of door frame structure therefor, comprising jambs and arch members, said jambs having lining supporting projections adjacent to their lower ends, and means for detachably securing said jamb portions to the furnace.

2. The combination with a furnace having a charging opening, of door frame structure therefor, comprising jamb and arch members, said jamb members having inwardly extending vertical portions disposed adjacent to that surface of the jamb members which is nearest the center of the furnace opening, and means for supporting a refractory lining against the inner edge of said offsets.

3. The combination with a furnace having a charging opening, of jamb members for said opening, such jamb members each having an inwardly extending vertical portion disposed adjacent to that surface of the jamb which is nearest the center of said opening, a second vertical portion disposed against the adjacent wall of the opening, said vertical portions together forming a structure that is L-shaped in cross section, and a horizontally extending brick support secured to the lower end of said vertical portions and disposed across the angle formed thereby.

4. The combination with a furnace having a charging opening, of jamb members for 3:

said opening, such jamb members each having an inwardly extending vertical portion disposed adjacent to that surface of the jamb which is nearest the center of said opening, a second vertical portion disposed against the adjacent wall of the opening, said vertical portions together forming a struct-ure that is L-shaped in cross section,

- a charging opening, of jamb members for said opening, com rising vertically disposed frames, each of w lich has one vertical wall v abutting a wall of the opening and its opposite wall defining the passage between the jambs, and an inwardly extending horizontal support secured to the lower end of each j amb, the said support being adapted to hold j refractory facing material.

.In testimony whereof I, the said Oman 60 H. DAvrsoN have hereunto set my hand.

ORRIN H. DAVISON. 

